Electrical protective device.



B H. SMITH & P. MAcGAHAN.

ELECTRICAL PROTECTIVE DEVICE. I

APPLICATION FILED NOV. 5. 1913.

1,199,437. PatentedSept. 26,1916.

WITNESSES: I I INVENTORS W y #M v BV/MMMQW ATTORNEY UNITED STATES PATENT OFFICE.

BENJAMIN H. SMITH, 0F TURTLE CREEK, AND PAUL MACGAHAN, O F PITTSBURGH, PENNSYLVANIA, ASSIGNORS TO WESTINGHOUSE ELECTRIC AND MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

ELECTRICAL PROTECTIVE DEVICE.

Specification of Letters Patent.

Patented Sept. 26, 1916.

To all whom it may concern Be it known that we, BENJAMIN H. SMITH, a citizen of the United States, and a resident of Turtle Creek, in the county of Allegheny and State of Pennsylvania, and PAUL MAG- GAHAN, a citizen of the United States, and a resident of Pittsburgh, in the county of Allegheny and State of Pennsylvania, haye invented a new and useful Improvement 111 Electrical Protective Devices, of which the following is a specification.

Our invention relates to electrical protective devices and particularly to relays.

The object of our invention is to provide a high tension relay having its contact members located an appreciable distance from its operating electromagnet.

High tension relays have heretofore been made in compact units with the contact and adjusting members in close proximity to the operating electromagnet. Tlns practice was considered dangerous and it did not permit of easy inspection and adjustment.

In our present invention, we provide a relay which has its high-tension electromagnet so located as to eliminate the danger of any one coming into contact with it, and which has a contact device, a time element, and a load setting adjustment connected to the high-tension electromagnet by a su1t ably insulated rod of appreciable length. The contact device may be located beneath or at either side of the electromagnet, and it may be adjusted for any time element characteristic.

Our invention has the advantage of absolute safety from the high voltage and admits of increased accessibility for adjustment.

In the accompanying drawings Figure 1 is a view of a relay shown partially in elevation and partially in section wherein 1S embodied our invention; Fig. 2 is a fragmentary view of the relay shown in Fig. 1 arranged for horizontal connection and shown partially in elevation and partially in section; Fig. 3 is a side sectional view of a spring member which is used in one modification of our invention, and Fig. 4 1s a sectional view, taken along the line IV IV of Fig. l.

Referring particularly to Fig. 1 of the drawings, our invention comprises an electromagnet 1 having a winding 2, a movable core 3, and a bell Crank 4 that is pivoted on a projection 5 on the case 6 of the electromagnet 1. The core 3 is pivotally attached to the arm 4 of the bell crank 4 and its degree of downward movement is limited by that of the arm 4a which is limited by a rod 7 attached to the electromagnet case 6. A rod 8 constructed of insulating material connects the arm 1 to a lever 9 that is pivoted at a point 10 on a device 11. The lever 9 has an arm 12 provided with adjustable weights 13 at one end, and a counter balance weight 14 at the other end. A. second movable lever 15 is pivoted at a point 16 on the device 11 and carries a movable contact member 17 and the movable member 18 of-a bellows 18. The bellows 18 com prises, besides the movable member 18*, a stationary member 19 having a regulating screw 20 for adjusting the time of its operation. A stationary contact terminal 21 is mounted on the device 11, and the lever 9 is operatively connected to the lever 15 by a rigid link 22 shown in Fig. 4. Referring now particularly to Fig. 3, the line 22 may be replaced by a slotted link 23 anda spring 24 for producing a definite time element in the operation of the relay.

Referring to Fig. 2, the rod 8 is connected to the bell crank a at a point 25 on the arm 1 The lever 9does not require a counter balance in the vertical position, as. here shown, and the arm 12 is moved to a position that is substantially at right angles to the lever 9; except for these differences, the structure is identical with that of the relay shown in Fig. 1.

\Vhen the winding 2 of the electromagnet 1 is excited a predetermined amount, it at tracts and draws up the movable core 3 which transmits its motion to the bell crank lever 4. By reason of the upward motion of the arm at of the bell crank lever 4c, the rod 8 is operated to transmit the motion of the movable core 3 to the pivoted lever 9 of the contact device 11 and cause ,it to turn around shown in Fig. 1, to actuate the lever 15 upon its pivot 16 and cause the contact member 17 to engage the contact member 21, according to predetermined time-element characteristics. As shown in Fig. 1, by the elimination of the bellows 18, the engaging of the contact members 17 and 21 would be instan- .100 the point 10, thus drawing up the link 22, as i g3 mews? tail-eons but, with the bellows COl'lnBCtBLiES shown, the time of engaging will vaiy inversely as the current in the Winding of the electronmgnel; l.

it the rigid link 22 shown in l 4: is replaced by the device shown in Fig. 3, the action slightly dill'ereiit from that hereiir liciorc explained. When the electromagnet l. is energized the spring 2% placed under tension and the tendency oi the spring to resumc. its initial shape draws up the lower part ill of the bellou's ifi, which may be set for any definite time of operation, thereby producing a definite limit between the time when the electron'iagnet l energized and the lime when the contact members 17' and 22 euga c. The usual nfactice is to mount the high-tension elcctromagnet on or near the eiling and the device 11 near the floor s l r, if it is desirable to mount them on i' l. a board or on a wall as approximately the same level, the rod 9 is attached to the point 25 on the bell crank 4, thus slioittiug the motion of the plunger 3 in approximately a horizontal direction to the contact device 11, as shown in F Changes may be made in the size, shape and arrangement of parts Without departfrom ihc scope of our invention as set in. the appended claims, We claim as our invention:

1. Eli: a relay, the com ination with an v-f *tromagoet and an operating rod, of a dece comprising a inaiii pivoted arm opers v connected to the operating arm, on a *y pivoted arm having; a contact thereon, and. means for opcratively euxi li ary in a relay, the combination an 'orziagiiet and an operating rod, of a we comprising a main pivoted arm operv 131 connected to the operating; arm, an liery pivoted arm having contact member thereon, means opcratively counectcd to the main arm for no ustiog the device to operate at dilicrert current values and means for operatively comm-ting the said main and auxiliary pivoted arms.

In a relay, the coinbiuatii'm with an i-ilcctronwgnet and an operating rod, of a device comprising a main pivoted arm operatively connected to the operating: arm, an auxiliary pivoted arm having a coutacl member thereon, means opcrativcly u. uecterl to the main arm lor adjusting; lildevice to operate at dillercnt current values and a linl: for opcratively connecting; the said main and auxiliary pivoted arms i. In a relay, the combination with an electromngnet and nu. operating rod, ol? :1 device comprising two pivoted lever ar'lu-s, means for operatively comic ting the anus together and means for opposing the oper ation'of one oi the said arms.

A relay device comprising a main pivoted lever arm, an auxiliary lever arm having Contact member moimted thereon a stationary contact member for cooperating: therewith and means for opcratively connecting the main and auxiliary arms; together.

(5. A relay device comprising a main pivoted lever arm, an auxiliary lever arm having a Contact member mounted thereon, a stationary contact member for cooperating therewith, means for connecting the main and auxiliary arms together and means for opposing the operation of the auxilimry arm.

In testimony whereof, We have hereunto subscribed our names this 30th. day of Oct, 1913,

Witnesses:

H, TAYLOR, B. B. dimes. 

